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Publication numberUS4317657 A
Publication typeGrant
Application numberUS 06/044,151
Publication dateMar 2, 1982
Filing dateMay 31, 1979
Priority dateMar 27, 1978
Publication number044151, 06044151, US 4317657 A, US 4317657A, US-A-4317657, US4317657 A, US4317657A
InventorsLeonard M. Niebylski
Original AssigneeEthyl Corporation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Gasoline additive fluids to reduce hydrocarbon emissions
US 4317657 A
Abstract
Exhaust hydrocarbon emissions of an internal combustion engine being operated on gasoline containing a cyclopentadienyl manganese antiknock are reduced by the addition of a dimer or a trimer acid or mixture of a dimer and a trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule to the gasoline.
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Claims(7)
I claim:
1. As a composition of matter, an additive fluid for low lead or essentially lead-free gasoline comprising an organo-manganese compound and an exhaust emission reducing amount of a compound selected from a dimer acid, a trimer acid, or a mixture of a dimer and trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule.
2. The composition of claim 1 wherein the weight ratio of emission-reducing compound to manganese is from about 1.0 to about 35.0 grams of emission reducing compound to 1.0 gram of manganese.
3. The composition of claim 2 wherein the weight ratio of emission reducing compound to manganese is from about 2.0 to about 15.0 grams of emission-reducing compound to 1.0 gram of manganese.
4. The composition of claim 2 wherein said organomanganese compound is a cyclopentadienyl manganese tricarbonyl.
5. The composition of claim 4 wherein said cyclopentadienyl group is a hydrocarbon group containing 5 to 17 carbon atoms.
6. The composition of claim 5 wherein said cyclopentadienyl group is methylcyclopentadienyl.
7. The composition of claim 6 wherein said exhaust emission reducing compound is the dimer acid derived from linoleic acid.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of Ser. No. 890,494 filed Mar. 27, 1978, now U.S. Pat. No. 4,175,927.

BACKGROUND OF THE INVENTION

Fuels used in today's automotive engine cause deposits to be formed during combustion. Such deposits collect on parts of the combustion chamber including valves, spark plugs, and cylinder heads and walls. Formation of these deposits can result in increased exhaust emissions.

Cyclopentadienyl manganese compounds are excellent antiknocks in gasolines used to operate internal combustion engines and have proven to be especially beneficial in solving some of the problems present when low-lead or lead-free gasolines are used with internal combustion engines.

Use of such compounds as antiknocks is described in U.S. Pat. Nos. 2,818,417, 2,839,552, and 3,127,351, all incorporated herein by reference.

SUMMARY OF THE INVENTION

According to the present invention, exhaust hydrocarbon emissions of internal combustion engines operating on gasoline containing a cyclopentadienyl manganese antiknock compound are reduced by gasoline compositions containing a dimer or trimer acid or a mixture of a dimer and trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The essence of the present invention resides in the reduction of exhaust emissions of internal combustion engines which burn gasoline containing an organomanganese compound. This reduction in exhaust emission is affected by addition to the gasoline of a dimer or a trimer acid or mixture of a dimer and a trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule to the gasoline. Accordingly, a preferred embodiment is a gasoline suitable for use in an internal combustion engine and containing an amount of organomanganese compound, preferably a cyclopentadienyl manganese tricarbonyl, sufficient to increase the gasoline's antiknock effectiveness, and also containing an exhaust emission reducing amount of a dimer or a trimer acid or a mixture thereof produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule.

A further embodiment of the present invention is a method for reducing exhaust emissions of internal combustion engines which operate on a gasoline containing an organomanganese compound by the addition to the gasoline of an exhaust emission reducing amount of a dimer acid, a trimer acid or a mixture of a dimer and trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule.

Liquid hydrocarbon fuels of the gasoline boiling range are mixtures of hydrocarbons having a boiling range of from about 80 F. to about 430 F. Of course, these mixtures can contain individual constituents boiling above or below these figures. These hydrocarbon mixtures contain aromatic hydrocarbons, saturated hydrocarbons and olefinic hydrocarbons. The bulk of the hydrocarbon mixture is obtained by refining crude petroleum by either straight distillation or through the use of one of the many known refining processes, such as thermal cracking, catalytic cracking, catalytic hydroforming, catalytic reforming, and the like. Generally, the final gasoline is a blend of stocks obtained from several refinery processes. The final blend may also contain hydrocarbons made by other procedures such as alkylate made by the reaction of C4 olefins and butanes using an acid catalyst such as sulfuric acid or hydrofluoric acid.

Preferred gasolines are those having a Research Octane Number of at least 85. A more preferred Research Octane Number is 90 or greater. It is also preferred to blend the gasoline such that it has a content or aromatic hydrocarbons ranging from 10 to about 60 volume percent, an olefinic hydrocarbon content ranging from 0 to about 30 volume percent, and a saturate hydrocarbon content ranging from about 40 to 80 volume percent, based on the whole gasoline.

In order to obtain fuels having properties required by modern automotive engines, a blending procedure is generally followed by selecting appropriate blending stocks and blending them in suitable proportions. The required octane level is most readily accomplished by employing aromatics (e.g. BTX, catalytic reformate or the like), alkylate (e.g., C6-9 saturates made by reacting C4 olefins with isobutane using a HF or H2 SO4 catalyst), or blends of different types.

The balance of the whole fuel may be made up of other components such as other saturates, olefins, or the like. The olefins are generally formed by using such procedures as thermal cracking, catalytic cracking and polymerization. Dehydrogenation of paraffins to olefins can supplement the gaseous olefins occurring in the refinery to produce feed material for either polymerization or alkylation processes. The saturated gasoline components comprise paraffins and naphthenates. These saturates are obtained from (1) virgin gasoline by distillation (straight run gasoline), (2) alkylation processes (alkylates) and (3) isomerization procedures (conversion of normal paraffins to branched chain paraffins of greater octane quality). Saturated gasoline components also occur in so-called natural gasolines. In addition to the foregoing, thermally cracked stocks, catalytically cracked stocks and catalytic reformates contain saturated components.

The classification of gasoline components into aromatics, olefins and saturates is well recognized in the art. Procedures for analyzing gasolines and gasoline components for hydrocarbon composition have long been known and used. Commonly used today is the FIA analytical method involving fluorescent indicator adsorption techiques. These are based on selective adsorption of gasoline components on an activated silica gel column. The components being concentrated by hydrocarbon type in different parts of the column. Special fluorescent dyes are added to the test sample and are also selectively separated with the sample fractions to make the boundaries of the aromatics, olefins and saturates clearly visible under ultraviolet light. Further details concerning this method can be found in "1969 Book of ASTM Standards," January 1969 Edition, under ASTM Test Designation D 1319-66T.

The motor gasolines used in formulating the improved fuels of this invention generally have initial boiling points ranging from about 80 to about 105 F. and final boiling points ranging from about 380 to about 430 F. as measured by the standard ASTM distillation procedure (ASTM D-86). Intermediate gasoline fractions boil away at temperatures within these extremes.

From the standpoint of minimizing atmospheric pollution to the greatest extent possible, it is best to keep the olefin content of the fuel as low as can be economically achieved as olefins reportedly give rise to smogforming emissions, especially from improperly adjusted vehicular engines. Accordingly, in the preferred base stocks of this invention the olefin content will not exceed about 10 volume percent and the most particularly preferred fuels will not contain more than about 5 percent olefins. Table 1 illustrates the hydrocarbon type makeup of a number of particularly preferred fuels for use in this invention.

              TABLE 1______________________________________Hydrocarbon Blends of Particularly Preferred Base Fuels              Volume PercentageFuel    Aromatics  Olefins        Saturates______________________________________A       35.0       2.0            63.0B       40.0       1.5            58.5C       20.0       2.5            77.5D       33.5       1.0            65.5E       36.5       2.5            61.0F       43.5       1.5            55.0G       49.5       2.5            48.0______________________________________

It is also desirable to utilize base fuels having a low sulfur content as the oxides of sulfur tend to contribute an irritating and choking character to smog and other forms of atmospheric pollution. Therefore, to the extent it is economically feasible, the fuel will contain not more than about 0.1 weight percent of sulfur in the form of conventional sulfur-containing impurities. Fuels in which the sulfur content is no more than about 0.02 weight percent are especially preferred for use in this invention.

Normally the gasoline to which this invention is applied is lead-free or substantially lead-free, although small amounts of organolead additives usually employed to give fuels of improved performance quality such as tetraalkyllead antiknocks including tetramethyllead, tetraethyllead, physical or redistributed mixtures of tetramethyllead and tetraethyllead, and the like may be present therein. The gasoline may also contain antiknock quantities of other agents such cyclopentadienyl nickel nitrosyl, N-methyl aniline, and the like. Antiknock promoters such as tert-butyl acetate may be included. The gasoline may further contain blending agents or supplements such as methanol, isopropanol, t-butanol and the like. Antioxidants such as 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-p-cresol, phenylenediamines such as N,N'-di-sec-butyl-p-phenylenediamine, N-isopropylphenylenediamine, and the like, may be present. Likewise, the gasoline can contain dyes, metal deactivators, or other types of additives recognized to serve some useful purpose in improving the gasoline quality.

Cyclopentadienyl manganese tricarbonyls are known antiknocks and their preparation and use as described in U.S. Pat. Nos. 2,818,417, 2,839,552, and 3,127,351. An important antiknock of this type is methylcyclopentadienyl manganese tricarbonyl. The amount of the cyclopentadienyl manganese tricarbonyl added to the gasolines should be an amount adequate to increase its antiknock effectiveness. This has generally been found to be in the range of from about 0.005 to 10 grams per gallon of manganese as a cyclopentadienyl manganese tricarbonyl. A preferred range is from about 0.05 to 6 grams of manganese per gallon as a cyclopentadienyl manganese tricarbonyl. A more preferred range is from about 0.05 to about 0.25 grams of manganese per gallon, and a most preferred range is from about 0.05 to about 0.125 grams of manganese per gallon as methylcyclopentadienyl manganese tricarbonyl.

The dimerized and trimerized unsaturated fatty acid component of the present invention is preferably a dimer or trimer of a comparatively long chain unsaturated fatty acid, i.e., an acid having about 16 or 18 carbon atoms, such as linoleic acid. When two molecules of linoleic acid react with one another, the product is a dimer acid. Similarly, when three molecules interact, the product is a trimer. However, it is to be understood that for purposes of this invention, one may use a product derived by reacting one molecule of one unsaturated fatty acid with a molecule of another unsaturated fatty acid. Similarly, one can condense one molecule of three different acids, or 2 molecules of one acid with one molecule of another to produce a trimeric product suitable for this invention. It is also to be understood that mixtures of the above described materials can be used. The dimer and trimer or mixtures of these as described above can be made by such procedures as set forth in Landis et al, U.S. Pat. No. 2,632,695. The dimer of linoleic acid has been found to be particularly suitable for use in the present invention. Particularly preferred is a 40 percent mixture of a dimer of linoleic acid in kerosene.

Commercial dimer and trimer products are highly efficacious components of compositions of this invention. Commercial products that have been found to be paticularly effective include those dimer acid products prepared by the Humko Sheffiend Chemical Company and known to the trade as Hystrene 3695, Hystrene 3687, Hystrene 3680, and Hystrene 3675. These products have the following characteristics:

__________________________________________________________________________           Hystrene                 Hystrene                      Hystrene                           HystrenePRODUCT         3695  3687 3680 3675__________________________________________________________________________SPECIFICATIONSNeut. Eq.       283-289                 284-295                      287-299                           285-297Acid Value      194-198                 190-198                      190-197                           189-197Sap Value       198-202                 195-201                      192-200                           191-199Color, Gard., Max.           5     7    8    9% Monomer, Max. 1.5 max.                 1.0 max.                      1.0 max.                           1.0 max.TYPICAL% Dimer         95    87   83   75% Trimer        4     13   17   25% Monomer       1     trace                      trace                           traceDimer/Trimer Ratio           36:1  10:1 7.3:1                           4.5:1Refrac. Index @ 25 C.           1.4830                 1.4842                      1.4839                           1.4853Spec. Grav. @ 25/25 C.           0.952 0.953                      0.954                           0.955Spec. Grav. @ 100/25 C.           0.905 0.907                      0.908                           0.908Lbs./Gal. @ 25 C.           7.94  7.95 7.96 7.96Pour Pt., F.           17    13   24   25Flash Pt., F., C.O.C.           550   580  580  600Fire Pt., F.           625   620  625  625Visc. @ 25 C. Cstks.           6800  7600 8000 9000Visc. @ 60 C. Cstks.           550   570  630  660Unsap           0.5   0.5  1.0  1.0Surf. Tens. @ 25  C. Dynes/cm           26.5  26.3 26.0 26.3__________________________________________________________________________ Humko can supply versions of Hystrene 3675 with varying monomer contents. They are designated by a letter suffix: A = 1-2% monomer, B = 2-3% monomer, C = 3-4% monomer, and D = 4-5% monomer. The variation in the percent monomer will, of course, change the above physical characteristic of our Hystrene 3675.

The amounts of hydrocarbon emission control additive compound, as for example, the dimer of linoleic acid, sufficient to reduce the hydrocarbon emission level is at least to some extent dependent upon the amount of manganese present in the gasoline. Generally, the greater the concentration of manganese, the greater the amount of additive compound needed to reduce deposit related hydrocarbon emission levels. A typical concentration range is from about 0.25 grams per gallon, to about 10 grams per gallon. It is to be understood that concentrations somewhat outside this range can be used if desired. The particularly preferred amount of compound is about 0.5-1.5 grams per gallon. There is no real known upper limit on the concentration of the hydrocarbon emission reducing compound. In general, one uses an additive quantity having adequate exhaust reducing properties.

The following examples, in which all parts are by weight, illustrate the preparation of the products of this invention.

EXAMPLE 1

To a blending vessel was added 30 gallons of a reformate gasoline having the following properties:

______________________________________Boiling range          87-408 F.Research octane number 93Aromatics (volume percent)                  28.5Olefinics (volume percent)                   8.0Aliphatics (volume percent)                  63.5______________________________________

To this gasoline was added an amount of methylcyclopentadienyl manganese tricarbonyl sufficient to provide 0.125 grams of manganese per gallon of fuel. There was then added to the gasoline a sufficient amount of the aforedescribed dimer of linoleic acid--40 percent mixture of dimer acid--in kerosene to give a concentration of 0.4 grams per gallon of fuel. The mixture was then agitated until thoroughly mixed. The result was a gasoline having reduced emission increasing properties.

EXAMPLE 2

The preparation of Example 1 was repeated and a product obtained having an amount of methylcyclopentadienyl manganese tricarbonyl sufficient to provide 0.125 grams of manganese per gallon of fuel and sufficient dimer acid to give a concentration of 0.4 grams of dimer acid per gallon of fuel.

EXAMPLE 3

The preparation of Example 1 was repeated except that a commercially prepared 95 percent pure dimer acid mixed with 4 percent trimer and one percent monomer acid product previously identified as Hystrene 3695 was substituted for the dimer acid (40 percent mixture in kerosene) of Example 1. An amount of Hystrene 3695 was added to the gasoline composition to give a concentration of 1.0 gram of the 95 percent pure dimer acid to each one gallon of fuel.

EXAMPLE 4

The preparation of Example 1 was repeated except that a commercially prepared trimer acid mixture prepared by Humko Sheffield Chemical Company and designated Hystrene 5460, was substituted for the dimer acid (40 percent mixture in kerosene) in Example 1. The trimer acid was 60 percent pure mixed with 39 percent dimer acid and one percent monomer acid.

Tests were run to illustrate the unusual and beneficial effects of the products of this invention on reducing exhaust emissions. In such tests, an Oldsmobile type single cyclinder engine with a 9.5:1 compression ratio is used, using Shell lOW-40 multigrade oil and a 28.5 percent aromatic fuel produced by Amoco and designated Amoco 91 containing 0.125 grams per gallon of fuel of methylcyclopentadienyl manganese tricarbonyl antiknock.

Engine Preparation.--Before each test, the combustion chamber, valves and valve parts are cleaned of deposits and the valves are reseated. The old oil is drained, the oil pan is flushed with new oil and then filled with new oil. A new AC-45 spark plug is installed and the fuel lines are flushed with test fuel.

Start of Test Procedure.--The engine is started on the aforementioned Amoco 91 fuel from a fuel burette, at 50 percent wide open throttle, at a speed of 1370 r.p.m., an air/fuel ratio of about 14.7:1 and with an ignition timing of 10 BTC. These conditions are maintained until the water and oil sump are at 1605 F. and the carburetor air is at 1105 F. At this condition exhaust measurements are made for hydrocarbon and carbon monoxide so as to detect any engine changes compared to other tests in the same engine. Hydrocarbon measurements are made with a Beckman 400 Flame Ionization Hydrocarbon Detector. Carbon monoxide is measured with a Beckman 315A Non-Dispersive Infrared Analyzer. Measurements are taken at two sampling points, one at the engine exhaust port and the other several inches from the engine after a mixing element.

The engine is then switched to the test fuel and the air/fuel ratio is adjusted to the stoichiometric air/fuel ratio required by the test fuel. At this time exhaust hydrocarbon emission measurements are made, giving a start-of-test-result, whereupon the engine is shut down and the oil level zeroed.

Time Accumulation Schedule.--The engine is restarted with test fuel on a cycling schedule alternating between the following conditions:

______________________________________Time, seconds 45         135Speed, r.p.m. 750-850    1,370Load          None       50 percent W.O.T.1Air/Fuel Ratio         14.2       StoichiometricIgnition Timing          10 BTCOil Sump, F.     165  5Water, F.        165  5Carburetor Air, F.                    110  5______________________________________ 1 Wide Open Throttle

The test is run for 100 hours with emission measurements made every 24 hours.

Periodic Emission Ratings.--After about each 24 hours of test time, hydrocarbon emission measurements are taken at 50 percent W.O.T. after which the engine is returned to the cycling schedule.

End of Test Procedure.--At the end of 100 hours of test, hydrocarbon emission measurements are taken at 50 percent W.O.T. and the engine is returned to a cycling schedule for a 1-2 hour period and then shut down. Oil consumption is then measured in ml/hr.

Using this procedure, the following results in terms of the percent of reduction in exhaust hydrocarbon emission were obtained using the emission reducing products of Examples 1, 2, 3 and 4.

              TABLE I______________________________________          Reduction of                            Emission                Emission    Increase %                Increase    Measured 8-10                % Measured at                            inches Down-   Concentration, g.                Engine Exhaust                            stream fromAdditive   Mn/gal. fuel Port        Exhaust Port______________________________________Product of   0.4          79          93Example 1Product of   0.4          45          35Example 2Product of   1.0          23          ...*Example 3Product of   1.0          35          ...*Example 4             48**       ...*______________________________________ *Measurements taken only at exhaust port. **Reduction of emission increase percent at the end of 102 hours.

As these results show, the emission reducing additives of the present invention effectively reduce exhaust emissions from engines operating on gasoline containing a cyclopentadienyl manganese antiknock.

It is convenient to utilize additive fluid mixtures composed of cyclopentadienyl manganese tricarbonyl antiknock agents and a dimer acid or a trimer acid or a mixture of a dimer and trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms per molecule. These additive fluid mixtures are added to low-head or unleaded gasoline. In other words, part of the present invention is exhaust emission-reducing fluids which comprise cyclopentadienyl manganese tricarbonyl antiknock agents and the exhaust emission-reducing agents of the type described hereinabove.

Use of such exhaust emission-reducing fluids in addition to resulting in great convenience in storage, handling, transportation, blending with fuels and so forth, also are potent concentrates which serve the multi-purpose functions of being useful as antiknocks and exhaust emission reducers. Thus, another embodiment of the invention is an additive fluid for low lead or essentially lead-free gasoline comprising an organomanganese compound and an exhaust-reducing amount of a compound selected from a dimer acid, a trimer acid or a mixture of a dimer and trimer acid produced by the polymerization or condensation of an unsaturated aliphatic monocarboxylic acid having between 16 and 18 carbon atoms.

In these fluid compositions the weight ratio of exhaust-emission-reducing agent to manganese can vary from about 1 to 35 grams of emission-reducing agent, such as the dimer and/or trimer of an unsaturated fatty acid having 16 or 18 carbon atoms to 1.0 grams of manganese. A preferred weight ratio of exhaust-emission-reducing agent to manganese is from about 2 to 15 grams of emission-reducing agent to 1.0 grams of manganese.

These fluids may optionally contain other additives such as antioxidants, anti-rust agent, detergents, etc., as well as solvents, e.g. a hydrocarbon to facilitate handling.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
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Referenced by
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US5511517 *Feb 10, 1994Apr 30, 1996Ethyl CorporationReducing exhaust emissions from otto-cycle engines
US5525127 *Nov 30, 1994Jun 11, 1996Ethyl Petroleum Additives LimitedEvaporative burner fuels and additives therefor
US5551957 *Dec 27, 1994Sep 3, 1996Ethyl CorporationCompostions for control of induction system deposits
US6971337Oct 16, 2002Dec 6, 2005Ethyl CorporationEmissions control system for diesel fuel combustion after treatment system
US7101493Aug 28, 2003Sep 5, 2006Afton Chemical CorporationMethod and composition for suppressing coal dust
US7332001Oct 2, 2003Feb 19, 2008Afton Chemical CorporationMethod of enhancing the operation of diesel fuel combustion systems
US7981170 *Apr 21, 2000Jul 19, 2011Shell Oil CompanyGasoline-oxygenate blend and method of producing the same
US8006652Aug 30, 2011Afton Chemical Intangibles LlcEmissions control system for diesel fuel combustion after treatment system
US20030226312 *Jun 7, 2002Dec 11, 2003Roos Joseph W.Aqueous additives in hydrocarbonaceous fuel combustion systems
US20040074140 *Oct 16, 2002Apr 22, 2004Guinther Gregory H.Method of enhancing the operation of a diesel fuel combustion after treatment system
US20050011413 *Jul 18, 2003Jan 20, 2005Roos Joseph W.Lowering the amount of carbon in fly ash from burning coal by a manganese additive to the coal
US20050016057 *Jul 21, 2003Jan 27, 2005Factor Stephen A.Simultaneous reduction in NOx and carbon in ash from using manganese in coal burners
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US20050072041 *Oct 2, 2003Apr 7, 2005Guinther Gregory H.Method of enhancing the operation of diesel fuel combustion systems
US20050091913 *Oct 29, 2003May 5, 2005Aradi Allen A.Method for reducing combustion chamber deposit flaking
US20050139804 *Feb 23, 2005Jun 30, 2005Ethyl Petroleum Additives, Inc.Method and composition for suppressing coal dust
US20050193961 *Mar 4, 2005Sep 8, 2005Guinther Gregory H.Emissions control system for diesel fuel combustion after treatment system
EP0662507A2 *Dec 12, 1994Jul 12, 1995Ethyl Petroleum Additives LimitedEvaporative burner fuels and additives therefor
EP1277828A2 *Feb 5, 2000Jan 22, 2003Basf AktiengesellschaftFuel composition
EP1411107A1Sep 23, 2003Apr 21, 2004Ethyl CorporationExhaust gas emission control system for a diesel engine
Classifications
U.S. Classification44/360
International ClassificationC10L1/18, C10L1/30, C10L1/14
Cooperative ClassificationC10L1/14, C10L10/10, C10L1/1883, C10L1/305, C10L10/02
European ClassificationC10L10/02, C10L10/10, C10L1/14
Legal Events
DateCodeEventDescription
Nov 5, 1981ASAssignment
Owner name: ETHYL CORPORATION; RICHMOND, VA., A CORP. OF VA.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NIEBYLSKI, LEONARD M.;REEL/FRAME:003927/0120
Effective date: 19790525